When you have perfected the casper while you are still you can then try it moving. This is more difficult but can be achieved with practice. After a while when you can do it moving you will find that you will catch it and be able to get a slide out of it. Exiting casper can be achieved in many ways but keep it basic and just flip it back with your front foot. The caspar can be time consuming to learn and the slide is the hardest part but after much practice you will get it. It is an impressive trick to pull off and can be used to show off.
wikipedia.org dumped 2003-03-17 with terodump